I myself did Epic Throne of Idris (a dungeon) and didn't get the reward for doing it during Dungeon Delves. My party had a 14k Gearscored Tank who made a party JUST to farm rewards in Epic Idris during Dungeon Delve. She was disappointed, and I felt bad for it. We even went back the way we came, to the entrance, and made sure we killed every enemy.